Hi I have this red pimple under my skin that feels hard and looks real noticeable. I haven't touched it in months and left it alone and still no difference. This month I used some Duac once daily gel and still no difference. I finished accutane a month ago and brilliantly I don't get any more pimples any more but now I'm just waiting for the marks to fade. But this one won't go away, like I got it 4 or 5 months ago and it still bad as it was then. I didn't pick at it or anything but it won't go away, any help would be appreciated. Will provide a pic if needed.

Best I can do as the lighting in my house is pretty bad, normally its much redder. I don't know what type of pimple this is and it's driving me insane! My derm told me not to touch and let it heal on its own and that was 5 months ago and it's still (if not worse ) better. any tips